Pierrick Bouvier <[email protected]> writes:
> For now, it simply performs instruction, bb and mem count, and ensure
> that inline vs callback versions have the same result. Later, we'll
> extend it when new inline operations are added.
>
> Use existing plugins to test everything works is a bit cumbersome, as
> different events are treated in different plugins. Thus, this new one.
>
> Signed-off-by: Pierrick Bouvier <[email protected]>
> ---
> tests/plugin/inline.c | 182 +++++++++++++++++++++++++++++++++++++++
> tests/plugin/meson.build | 2 +-
> 2 files changed, 183 insertions(+), 1 deletion(-)
> create mode 100644 tests/plugin/inline.c
>
> diff --git a/tests/plugin/inline.c b/tests/plugin/inline.c
> new file mode 100644
> index 00000000000..28d1c3b1e48
> --- /dev/null
> +++ b/tests/plugin/inline.c
> @@ -0,0 +1,182 @@
> +/*
> + * Copyright (C) 2023, Pierrick Bouvier <[email protected]>
> + *
> + * Demonstrates and tests usage of inline ops.
> + *
> + * License: GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#include <glib.h>
> +#include <stdint.h>
> +#include <stdio.h>
> +
> +#include <qemu-plugin.h>
> +
> +typedef struct {
> + uint64_t count_tb;
> + uint64_t count_tb_inline;
> + uint64_t count_insn;
> + uint64_t count_insn_inline;
> + uint64_t count_mem;
> + uint64_t count_mem_inline;
> +} CPUCount;
I wonder if there is any way to enforce the structures being an array of
64 bit counts? I do worry the compiler might want day decide to do
something silly but legal leading to confusion.
I guess qemu_plugin_scoreboard_new could:
g_assert((element_size % sizeof(uint64_t)) == 0)
?
> +static qemu_plugin_u64_t count_tb;
> +static qemu_plugin_u64_t count_tb_inline;
> +static qemu_plugin_u64_t count_insn;
> +static qemu_plugin_u64_t count_insn_inline;
> +static qemu_plugin_u64_t count_mem;
> +static qemu_plugin_u64_t count_mem_inline;
Can't this just be a non scoreboard instance of CPUCount?
> +
> +static uint64_t global_count_tb;
> +static uint64_t global_count_insn;
> +static uint64_t global_count_mem;
> +static unsigned int max_cpu_index;
> +static GMutex tb_lock;
> +static GMutex insn_lock;
> +static GMutex mem_lock;
> +
> +QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
> +
> +static void stats_insn(void)
> +{
> + const uint64_t expected = global_count_insn;
> + const uint64_t per_vcpu = qemu_plugin_u64_sum(count_insn);
> + const uint64_t inl_per_vcpu =
> + qemu_plugin_u64_sum(count_insn_inline);
> + printf("insn: %" PRIu64 "\n", expected);
> + printf("insn: %" PRIu64 " (per vcpu)\n", per_vcpu);
> + printf("insn: %" PRIu64 " (per vcpu inline)\n", inl_per_vcpu);
> + g_assert(expected > 0);
> + g_assert(per_vcpu == expected);
> + g_assert(inl_per_vcpu == expected);
> +}
> +
> +static void stats_tb(void)
> +{
> + const uint64_t expected = global_count_tb;
> + const uint64_t per_vcpu = qemu_plugin_u64_sum(count_tb);
> + const uint64_t inl_per_vcpu =
> + qemu_plugin_u64_sum(count_tb_inline);
> + printf("tb: %" PRIu64 "\n", expected);
> + printf("tb: %" PRIu64 " (per vcpu)\n", per_vcpu);
> + printf("tb: %" PRIu64 " (per vcpu inline)\n", inl_per_vcpu);
> + g_assert(expected > 0);
> + g_assert(per_vcpu == expected);
> + g_assert(inl_per_vcpu == expected);
> +}
> +
> +static void stats_mem(void)
> +{
> + const uint64_t expected = global_count_mem;
> + const uint64_t per_vcpu = qemu_plugin_u64_sum(count_mem);
> + const uint64_t inl_per_vcpu =
> + qemu_plugin_u64_sum(count_mem_inline);
> + printf("mem: %" PRIu64 "\n", expected);
> + printf("mem: %" PRIu64 " (per vcpu)\n", per_vcpu);
> + printf("mem: %" PRIu64 " (per vcpu inline)\n", inl_per_vcpu);
> + g_assert(expected > 0);
> + g_assert(per_vcpu == expected);
> + g_assert(inl_per_vcpu == expected);
> +}
> +
> +static void plugin_exit(qemu_plugin_id_t id, void *udata)
> +{
> + const unsigned int num_cpus = qemu_plugin_scoreboard_size(counts);
> + g_assert(num_cpus == max_cpu_index + 1);
> +
> + for (int i = 0; i < num_cpus ; ++i) {
> + const uint64_t tb = *qemu_plugin_u64_get(count_tb, i);
> + const uint64_t tb_inline = *qemu_plugin_u64_get(count_tb_inline, i);
> + const uint64_t insn = *qemu_plugin_u64_get(count_insn, i);
> + const uint64_t insn_inline = *qemu_plugin_u64_get(count_insn_inline,
> i);
> + const uint64_t mem = *qemu_plugin_u64_get(count_mem, i);
> + const uint64_t mem_inline = *qemu_plugin_u64_get(count_mem_inline,
> i);
> + printf("cpu %d: tb (%" PRIu64 ", %" PRIu64 ") | "
> + "insn (%" PRIu64 ", %" PRIu64 ") | "
> + "mem (%" PRIu64 ", %" PRIu64 ")"
> + "\n",
> + i, tb, tb_inline, insn, insn_inline, mem, mem_inline);
> + g_assert(tb == tb_inline);
> + g_assert(insn == insn_inline);
> + g_assert(mem == mem_inline);
> + }
> +
> + stats_tb();
> + stats_insn();
> + stats_mem();
> +
> + qemu_plugin_scoreboard_free(counts);
> +}
> +
> +static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
> +{
> + (*qemu_plugin_u64_get(count_tb, cpu_index))++;
> + g_mutex_lock(&tb_lock);
> + max_cpu_index = MAX(max_cpu_index, cpu_index);
> + global_count_tb++;
> + g_mutex_unlock(&tb_lock);
> +}
> +
> +static void vcpu_insn_exec(unsigned int cpu_index, void *udata)
> +{
> + (*qemu_plugin_u64_get(count_insn, cpu_index))++;
> + g_mutex_lock(&insn_lock);
> + global_count_insn++;
> + g_mutex_unlock(&insn_lock);
> +}
> +
> +static void vcpu_mem_access(unsigned int cpu_index,
> + qemu_plugin_meminfo_t info,
> + uint64_t vaddr,
> + void *userdata)
> +{
> + (*qemu_plugin_u64_get(count_mem, cpu_index))++;
> + g_mutex_lock(&mem_lock);
> + global_count_mem++;
> + g_mutex_unlock(&mem_lock);
> +}
> +
> +static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
> +{
> + qemu_plugin_register_vcpu_tb_exec_cb(
> + tb, vcpu_tb_exec, QEMU_PLUGIN_CB_NO_REGS, 0);
> + qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
> + tb, QEMU_PLUGIN_INLINE_ADD_U64, count_tb_inline, 1);
> +
> + for (int idx = 0; idx < qemu_plugin_tb_n_insns(tb); ++idx) {
> + struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, idx);
> + qemu_plugin_register_vcpu_insn_exec_cb(
> + insn, vcpu_insn_exec, QEMU_PLUGIN_CB_NO_REGS, 0);
> + qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu(
> + insn, QEMU_PLUGIN_INLINE_ADD_U64, count_insn_inline, 1);
> + qemu_plugin_register_vcpu_mem_cb(insn, &vcpu_mem_access,
> + QEMU_PLUGIN_CB_NO_REGS,
> + QEMU_PLUGIN_MEM_RW, 0);
> + qemu_plugin_register_vcpu_mem_inline_per_vcpu(
> + insn, QEMU_PLUGIN_MEM_RW,
> + QEMU_PLUGIN_INLINE_ADD_U64,
> + count_mem_inline, 1);
> + }
> +}
> +
> +QEMU_PLUGIN_EXPORT
> +int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
> + int argc, char **argv)
> +{
> + counts = qemu_plugin_scoreboard_new(sizeof(CPUCount));
> + count_tb = qemu_plugin_u64_struct(counts, CPUCount, count_tb);
> + count_insn = qemu_plugin_u64_struct(counts, CPUCount, count_insn);
> + count_mem = qemu_plugin_u64_struct(counts, CPUCount, count_mem);
> + count_tb_inline = qemu_plugin_u64_struct(counts, CPUCount,
> count_tb_inline);
> + count_insn_inline =
> + qemu_plugin_u64_struct(counts, CPUCount, count_insn_inline);
> + count_mem_inline =
> + qemu_plugin_u64_struct(counts, CPUCount, count_mem_inline);
> + qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
> + qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
> +
> + return 0;
> +}
> diff --git a/tests/plugin/meson.build b/tests/plugin/meson.build
> index e18183aaeda..9eece5bab51 100644
> --- a/tests/plugin/meson.build
> +++ b/tests/plugin/meson.build
> @@ -1,6 +1,6 @@
> t = []
> if get_option('plugins')
> - foreach i : ['bb', 'empty', 'insn', 'mem', 'syscall']
> + foreach i : ['bb', 'empty', 'inline', 'insn', 'mem', 'syscall']
> if host_os == 'windows'
> t += shared_module(i, files(i + '.c') +
> '../../contrib/plugins/win32_linker.c',
> include_directories: '../../include/qemu',
Otherwise:
Reviewed-by: Alex Bennée <[email protected]>
--
Alex Bennée
Virtualisation Tech Lead @ Linaro
